Add auth route with login logout verify - #42

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Failed to save: Unable to reserve cache with key setup-uv-2-x86_64-unknown-linux-gnu-ubuntu-24.04-3.12.3-pruned-ef000a2dedfb8b31a0f2015c7292bb76248da82e18ee45ea77da6eba48c0a726, another job may be creating this cache.